A pair of recent filings in U.S. litigation over alleged foreign exchange rate manipulation has revealed a dispute that pits Quinn Emanuel Urquhart & Sullivan against the plaintiffs firms Hausfeld and Scott + Scott.

The dispute, which revolves around foreign exchange rate antitrust litigation, takes on added import because all three firms are eyeing key roles in similar litigation overseas.

The spat between the firms stems from a memorandum that Quinn Emanuel crafted in late 2016 and early 2017 about the foreign exchange rate antitrust litigation and later sent to plaintiffs firm Bernstein Liebhard and multiple institutional investors. Hausfeld and Scott + Scott serve as co-lead counsel in the United States for investor plaintiffs in the foreign exchange rate litigation, while Quinn Emanuel in 2014 lost a bid for a lead plaintiffs counsel role.